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Hi everybody,
We're trying to create a custom rule which will be used by Digester. We
follow the steps indicated in
http://jakarta.apache.org/commons/digester/commons-digester-1.8/docs/api/
Creating a digester from XML:
|FromXmlRuleSet| is a |RuleSet| implementation that initializes its
|Digester| from rules defined in an XML file. The path to the XML file
is passed to constructor.
Alternatively, the convenience class DigesterLoader defines a static
method, |Digester createDigester(String rulesXml) throws
DigesterLoaderException|". When passing the name of the file that
contains your digester rules, this method returns a |Digester| instance
initialized with the rules.
To add your own rules, you need to:
* Update the DTD
You should add an element type for your rule. The element should
have an attribute corresponding to each of the rule's
initialization parameters.
* Define an |ObjectCreationFactory|
* Extend |DigesterRuleParser|
|DigesterRuleParser| is a |RuleSet| for parsing a rules XML file.
You should extend this, and override the |addRuleInstances()|
method to add the rules for parsing your new element. Look in
DigesterRuleParser.java to see how its done.
but we had a problem with the inner class PatternRule of
DigesterRuleParser. We overrided addRuleInstances(Digester digester)
method but there was a compilation error because PatternRule is a
private class
How can we resolve this problem?
This is the source problem, with the error
import org.apache.commons.digester.AbstractObjectCreationFactory;
import org.apache.commons.digester.Digester;
import org.apache.commons.digester.Rule;
import org.apache.commons.digester.xmlrules.DigesterRuleParser ;
import org.xml.sax.Attributes;
public class SetTopPropertyRuleParser extends DigesterRuleParser {
public class SetTopPropertyRuleFactory extends
AbstractObjectCreationFactory{
@Override
public Object createObject(Attributes attributes) throws Exception {
String methodName = attributes.getValue("methodname");
String paramType = attributes.getValue("paramtype");
if (paramType != null){
return new SetTopPropertyRule(methodName, paramType);
}else{
return new SetTopPropertyRule(methodName);
}
}
}
public SetTopPropertyRuleParser(Digester targetDigester) {
super(targetDigester);
}
@Override
public void addRuleInstances(Digester digester) {
super.addRuleInstances(digester);
final String ruleClassName = Rule.class.getName();
digester.addRule("*/set-top-property-rule", new
PatternRule("pattern")); // ERROR PatternRule is a private class
digester.addSetNext("*/set-top-property-rule","add", ruleClassName);
}
}
Note: I'm sorry for my english
--
Un saludo,
David
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